XXII ISPRS Congress 2012: Technical Commission VII

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Persistent identifier:: 1663813779

Title:: XXII ISPRS Congress 2012

Sub title:: Melbourne, Australia, 25 August-1 September 2012

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663813779

Language:: English

Additional Notes:: Kongress-Thema: Imaging a sustainable future

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1663821976

Title:: Technical Commission VII

Scope:: 546 Seiten

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663821976

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(39,B7)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.; Literaturangaben

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [VII/5: METHODS FOR CHANGE DETECTION AND PROCESS MODELLING]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: A SEMIAUTOMATIC ANOMALOUS CHANGE DETECTION METHOD FOR MONITORING AIMS G. Artese, V. Achilli, M. Fabris, M. Perrelli

Document type:: Multivolume work

Structure type:: Chapter

3.2 Test 2: real case in a cloudy day Figure 6 shows the base image. In this case a costrained Delaunay triangulation has been performed and the homologous points of the vertices are found in the new image to compare. The preprocessing previously described is performed. Figure 7 shows the new image with the triangulation. It must be underlined that the triangles obtained have been extracted after the resampling (affine transformation) of a wider area, to avoid misregistration on the borders. The comparison will be performed for every triangle; figure 10 shows the upper-right triangle after the affine transformation, with the contour of the detected anomalies. The histogram of the images difference shows a high peak (figure 8). The 3D representation of the differences (the triangle of figure 7 has been subtracted) is shown in figure 9 (after shift and non maxima suppression). Figure 7. The new image of test 2 with the triangulation Figure 8. Histogram of images difference of test 2 3.3 Test 3: real case in a sunny day Figure 11 shows the new image. Figure 12 shows the upper- right triangle after the affine transformation, which has been subtracted. The histogram of the images difference shows three International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B7, 2012 XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia humps similar to a Gaussian distribution (figure 13): the sun causes a false change. The 3D representation of the differences (figure 14) shows both positive (true) and negative (false) differences. In the shadowed zone no differences are detected. To better understand this case, we perform the differences limited to the single humps. Figures 15 and 16 show these differences. It is evident that the judgement of an operator is necessary, to distinguish the real changes from the false ones. Figure 9. 3D view of image difference of test 2 after radiometric shift and non maxima suppression Figure 10. The upper-right triangle of new image of test 2: the stain is well detected and isolated.

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